Scott 1502 mint sheet 15c (50) - Progress in Electronics, 1973 Commemorative Stamps. representative stamp imaged.
Scott 1502 mint sheet 15c (50) - Progress in Electronics, 1973 Commemorative Stamps. representative stamp imaged.
Scott 1502 mint sheet 15c (50) - Progress in Electronics, 1973 Commemorative Stamps. representative stamp imaged.